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Equipment and measurement standards vary. It might not be possible to compare them directly, but for sure, the Boeing 747-8 flight deck is by far one of the noisiest amongst larger jets. It's not just the wind noise, it's also various fans that also add to it. Especially when we fly at lower...

I was looking for a way to send a PM, but here is the link then, for a video: You can hear the normally generated tone (mainly below 12-13 KHz). But watch what happens when I vary the frequency around 16KHz - you hear that interference tone. Difference tone. Or whatever tone it is. YES, it...

Yes, just don't plug anything in to the 3.5mm minijack. I have done that a lot - just enjoying the silence. But that's question: Do ANR really give "silence"? Or just perceived silence? Although it's meant to cancel out, there is still pressure there. Just try to sit in a train, and enter a...

"There are two types of combination tones: sum tones whose frequencies are found by adding the frequencies of the real tones, and difference tones whose frequencies are the difference between the frequencies of the real tones" https://en.wikipedia.org/wiki/Combination_tone Yeah, these tones. I...

If you play two tones at the same time, they mix up to create other tones. The best examples are DTMF from telephones, or the similar SELCAL system for HF communications (and others). Two engines of a twin engined aircraft - if they run at almost the same RPM, you can hear that wow-wow-wow...

It's a noisy flight deck, and we still have to be able to hear both ATC and our colleague(s). It would be awesome with something like bluetooth wireless headsets, in-ear and custom fit. No ANR, just blocking it. If we could all wear these, no cables and even be able to keep wearing them when...

Thank you for your feedback. If it only was as simple as to "wear a passive headset". First of all, the local aviation authority requires that we only use the one headset that "they approve with the airplane". Yes, they are stupid with that (and many other things). So we are not allowed to use...

I got a set of Bose QC20 recently. They really work well but my almost non-existant tinnitus has now become much worse. For this phenomena, I don't think it's about the volume you play music or other sounds. I have it suspected that for processing the noice cancelling at lower frequencies...

My main point here is: There is a chance that although ANR cancels noise at some frequencies, with great success, there also seems to be some indication that it also gives tinnitus at higher frequencies. If tinnitus is a side effect of using ANR, then it really needs to be exposed. I have now...

I work as a pilot. I have almost 15 years to retirement (well, supposedly). I am starting to hear high pitch tones and I am suspecting that ANR headsets might increase, rather than decrease tinnitus. I have now read a lot of posts where people just got ANR equipment (example: Bose SleepBuds)...

Here is my opinion: Just got Bose QC20 ANR headphones recently. I have the ANR circuitry suspected of using a 16 kHz pilot tone, possibly similar to how stereo FM uses 19 kHz as a pilot tone (although the latter to indicate stereo available). The QC20 are really effective - at least in the...

One further experiment I just did after posting that above: Bose Noise cancelling headphones in ears, noise cancelling ON. Not connected to any source, just headphones plus noise cancelling. JBL ANR E-series on ear headphones ON TOP OF the Bose. Switched OFF so no ANR in the JBLs, but...

I work as an airline pilot. The big tinnitus is a big no-no here, if it starts affecting your medical (hearing test). Pilots are generally tested at 500, 1000, 2000 and 3000 Hz. Hearing loss limits are 35dB except at 3000Hz, it's 50dB. If you get above that limit, you have to have a practical...

16KHz